Some random thoughts:
Christ does not save nations, He saves individuals and sends them forth with His message to share with others.
Life is an iteration of the Garden of Eden and Christ’s redemption. We started with everything we would ever need for sustenance and happiness, yet we separated ourselves from it. The Trinity, through Christ’s birth, life, death and resurrection redeemed us and made everything again available to us. Life for man has been this oscillation of separation and rejoining. Where will each be when the wheel stops?
No, the Lord does not save nations in the sense of salvation to eternal life that He offers to each of us individually, but He does show favor to nations that acknowledge Him. I have no doubt that the Lord had everything to do with establishing the United States, and He caused us to do well for a couple of hundred years, because our Founders placed great importance on Christian morality in good government and God in His proper place above us.
Our culture began to disintegrate when we turned our collective backs on Him back in the 60s. That is what I meant when I said our nation must make a sharp, right-hand U-turn back to the Lord if we have any hope at all of stopping our slide into a communist totalitarian state.
Frankly, I don’t believe America will be spared at this point. With the widespread embrace of perversion and immorality in our culture and institutions (homosexual “marriage,” etc.) I do not believe God will smile on this nation moving forward.
Likewise, neither does He save church "organizations"; another "collective".
You are referring to the INVISIBLE church.
IE: Each individual (at whatever level of understanding) in whom dwells / is led by the Holy Spirit, embodies "the true Church".
Individuals comprising the true Church are scattered all over the world, and may or may not, be members of any of the VISIBLE brick and mortar organizations of men (a mixture of the wheat and the chaff) at any given time.
IMO, of course. :)